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OPA2613 Fiches technique(PDF) 17 Page - Texas Instruments

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No de pièce OPA2613
Description  Dual, Wideband, High Output Current, Operational Amplifier with Current Limit
Download  27 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

OPA2613 Fiches technique(HTML) 17 Page - Texas Instruments

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OPA2613
SBOS249D − JUNE 2003− REVISED APRIL 2004
www.ti.com
17
1/2
OPA2613
+5V
+V
S
VS /2
806
100
VO
V
I
57.6
806
RF
402
RG
402
0.1
µF
0.1
µF
6.8
µF
+
0.1
µF
Figure 3. AC-Coupled, G = +2, Single-Supply,
Specification and Test Circuit
The last configuration used as the basis of the +5V
Electrical and Typical Characteristics is shown in Figure 4.
Design considerations for this inverting, bipolar supply
configuration
are
covered
either
in
single-supply
configuration (as shown in Figure 3) or in the Inverting
Amplifier Operation section.
1/2
OPA2613
+5V
V
S /2
806
V
I
100
V
O
806
R
F
402
R
M
57.6
6.8
µF
+
0.1
µF
0.1
µF
0.1
µF
R
G
402
Figure 4. AC-Coupled, G = −1, Single-Supply,
Specification and Test Circuit
DIFFERENTIAL INTERFACE APPLICATIONS
Dual op amps are particularly suitable to differential input
to differential output applications. Typically, these fall into
either Analog-to-Digital Converter (ADC) input interface or
line driver applications. Two basic approaches to
differential I/O are noninverting or inverting configurations.
Since the output is differential, the signal polarity is
somewhat meaningless—the noninverting and inverting
terminology applies here to where the input is brought into
the OPA2613. Each has its advantages and disadvan-
tages. Figure 5 shows a basic starting point for
noninverting input differential I/O applications.
R
F
402
R
F
402
1/2
OP A2613
+V
CC
Power−Supply
decoupling not
shown.
−V
CC
R
G
268
V
O
1/2
OP A2613
V
I
Figure 5. Noninverting Differential I/O Amplifier
This
approach
provides
for
a
source termination
impedance that is independent of the signal gain. For
instance, simple differential filters may be included in the
signal path right up to the noninverting inputs without
interacting with the gain setting. The differential signal gain
for the circuit of Figure 5 is:
A
D
+ 1 ) 2
R
F
R
G
Since the OPA2613 is a voltage-feedback (VFB) amplifier,
its bandwidth is principally controlled by the noise gain.
The equivalent noise gain for Figure 5 is:
1
) 2
402
W
268
W +
4V V
Various combinations of single-supply or AC-coupled gain
can also be delivered using the basic circuit of Figure 5.
Common-mode bias voltages on the two noninverting
inputs pass on to the output with a gain of 1 since an equal
DC voltage at each inverting node creates no current
through RG. This circuit does show a common-mode gain
of 1 from input to output. The source connection should
either remove this common-mode signal if undesired
(using an input transformer can provide this function), or
the common-mode voltage at the inputs can be used to set
the output common-mode bias. If the low common-mode
rejection of this circuit is a problem, the output interface
may also be used to reject that common-mode. For
instance, most modern differential input ADCs reject
common-mode signals very well, while a line driver
application through a transformer will also remove the
common-mode signal through to the line.
(1)
(2)


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